Yes it will be hot, hotter than a snakes ass in a wagon rut.
I'm just back and we saw temperatures upto 42 a couple of weeks ago although that was top end for the trip. For me its when the overnight temps don't drop below 30 when it gets too much (unless your in a hotel with AC)
5-6 days is not very long for a trip, to get down to the south will eat up a lot of time for your trip, say 2-4 days down and back again depending on how long you travel each day. If you stick to the coast and mountains temps will be much more reasonable.
Unless you are planning to head inland in the Western Sahara or the far east you are unlikely to need to carry water for more than a day, lots of towns and villages around to restock
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